Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4a9cb25ee9188b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 13:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a18c7e8ca9ba6a023c9252a13ee4bb0 SHA-1: 949a6e3f745d2bd3c09fad467ddee00565fe7ba3 SHA-256: fa4a9cb25ee9188b56d4dc48667cb941a018c99bebae01e3f5c1432ee3aea67f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of a link farm suggests an attempt to redirect the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=ads+blockers+for+chrome PDF link annotation
    • http://ternovykh.ru/content/file/998528093.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/19669869840.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614561ad08fc7---34502342590.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bukiwuzenu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/retunerete.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/pogagazoramufirupinalona.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/38401439270.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/metesajubakujejete.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e937283f27---mubizurozasovuzo.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/45671039764.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/64915147587.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/labofaxutafixagopakabafit.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146f19057dcd---73347277222.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210922151927.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346c5c59798---dekonijijuwomanipagi.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/66205693561.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/nilusufokolazoduk.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/nimekuzofori.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/33344648635.pdfIn PDF document text
    • https://tcremich.lu/files/files/medolejovuviwuvuromibar.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210907174829.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/79907167632.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/fosovune.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/76427785268.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/53109385705.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 10496 bytes
SHA-256: 264ede55cf20b7dd37bee2dd47947baf151d8dd87942fd0d0f2e9ef23cc07c68
font_02_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 16604 bytes
SHA-256: 2461457e632235347957b8a63b651c88e1a8a536bc28ee18d53d3d677e1e247e

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